Oil-well jack.



. PATENTED SEPT. 29, 1903.

J. BARRETT. OIL WELL JACK.

APPLICATION FILED MAR. 23. 1903.

K0 MODEL.

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W g H 2101 m man UNITED STATES iatented September 29, 190s.

PATENT OFFICE:

.OlL-WELL JACK.

SPECIFICATION forming part of Letters Patent No. 739,812, dated September 29, 1903.

Application filed March 23, 1903.

To all whom it may concern: Be it known that I, JOSIAH BARRETT, a resident of Bellevue, in the county ofAllegheny and State of Pennsylvania, have invented a new and useful Improvement in Oil Well Jacks; and I do hereby declare the following to be a full, clear, and exact description thereof. My invention relates to oil-well and similar jacks; and its object is to simplify the jack construction, and more especially the necessary attachments therefor at the well.

Oil-well jacks as now constructed comprise an I-shaped rack-bar bent into arc form and which is fixedly attached to the floor at the well in such position that the well or the drilling rods are the center of said are. The jack frame or cage, as it is called and which contains the pawls and operating mechanism and to which the pulling-wrench lever is connected, travels on this arc-shaped rack to unscrew the drill-rods. This construction necessitates a rack-bar having grooves in its sides and which is quite expensive, and, furthermore, as this rack-bar must be attached to the floor it is in the way of other operations.

The object of my invention is to provide an oil-well jack wherein these objectionable features are overcome. To this end it consists, generally stated, in constructing the frame or cage so that it can be secured to the door or other suitable support and preferably pivoted thereto and making the rack-bar itself movable, so that no part need be permanently attached to the floor, and thus be in the way of the workman while drilling and also enabling the use of the straight square or rectangular rack-bar.

The invention also comprises a clamp or bracket secured on the wrench-lever to prevent the wrench-post from sliding down the same, as well as other details of construction hereinafter described and claimed.

In the accompanying drawings, Figure 1 is a side view, partly in section, showing my improved jack andits mode of application. Fig.2 is a diagrammatic plan viewshowin g the mode of operation of said jack. Fig. 3 is a transverse section through the rack-bar; and Fig. a is a similar view through the jack-lever, showing the clamp.

In the drawings the drill-rods are indicated $erial No. 149,146. (Nomodeld at 1 and the pulling-wrench at 2 and the stationary wrench at 3. The jack itself comprises a cage or frame 4, which is adapted to be secured to the floor 5 or other support, and thus become the stationary part of the device. Preferably this attachment will be such that the said frame or cage can swing to accommodate itself to the different angles of the rack-bar, and this can conveniently be accomplished by providing the frame with a downwardly-projecting pivotalstud 6, which is adapted to fit into the bushing 7, secured to the floor. This cage is provided with a horizontal'passage-way through it for the rack-bar 9. The latter is a simple square bar and has at its outer end the wrench-post 10 for engaging the pulling-wrench 2, a corresponding abutment 11 being formed on the frame or cage for the engagement of the stationary wrench 3.

Suitable mechanism will be provided in the frame or cage for moving the rack-lar longitudinally ,therethrough, the mechanism shown in the drawings comprising suitable pawls 12 and 13, which engage the ratchetteeth 14 on the bar, together with a lever 15 for operating said pawls. This operating mechanism, however, may be of any known kind or description, that shown in the drawings illustrating in addition to the lever and pawls various other features common in jackingmeohanism-such, for instance, as the holding-detent 16, which is pivoted on the cage and arrangedto engage the pawls and hold themoutof engagement with the rackbar, so that the latter can be drawn back and forth to any required'position, according to the location of the wrenches.

On the wrench-lever 2, adjacent to the point of engagement with the wrench-post l0 therewith, I provide a suitable shoulder or abutment to prevent said wrench-post from sliding toward the pivotal end of said wrench. This shoulder or abutment may be formed by bending the end of the wrench or may be in the form of a clamp 18, which can be readily attached to the end of any existing wrench.

In the use of my invention the frame or cage 4 is secured to the floor or other support by means of the pivotal stud 6, and consequently is free to swing around said stud.

The end of the stationary wrench is placed against the abutment 11, while the wrenchpost on the rack-bar engages the end of the pulling-wrench. The lever is then operated, thus moving the rack-bar 9 through the cage in a well-understood manner and drawing the pulling-wrench around, as indicated in Fig. 2. During this movement the cage will pivot on the stud 6, so as to accommodate itself to the position of the rackbar 9.

By the construction shown and described the jack mechanism is very much simplified, as it requires only a simple straight square rack-bar, and the frame or cage itself is practically as simple as heretofore, having no additions thereto except the pivotal stud 6. Furthermore, the entire arrangement is such that all parts can be readily removed from the door and put in position again when needed, so that when the jack is not in use the floor can be entirely clear, so that no obstructions with other operations will exist.

What I claim as my invention, and desire to secure by Letters Patent, is

1. In oilwell and similar jacks, thecombination with a frame or cage havinga passageway therethrough, of means for securing the same to a floor or other support, a rack-bar arranged to reciprocate horizontally in the passage-way in said frame, and operating mechanism for said bar in said frame.

2. In oil-well and similar jacks, the combination with a frame or cage having a passageway therethrough, of means for pivotally securing the same to a floor or other support, a rack-bar arranged to reciprocate horizontally in the passage-way in said frame, and operating mechanism for said bar in said frame.

3. In oil-well and similar jacks, the combination with a frame or cage having a passageway therethrough and provided with a stud on its lower face whereby it may be secured to a floor or other support, a rack-bar arranged to reciprocate in the passage-way in said frame, and operating mechanism for said bar in said frame.

4:. In oil-well and similar jacks, the combination with a frame or cage having a passageway therethrough, of means for securing the same to a floor or the like, a ratchet-bar arranged to reciprocate horizontally in the passage-way in said frame, and a lever-and-pawl mechanism in said frame for operating said bar.

5. In oil-well and similar jacks, the combination with a frame or cage having a passageway therethrough, of means for securing the same to a floor 'or other support, a ratchet-bar arranged to reciprocate longitudinally in the passage-way in said frame, an actuating-lever and pawls in said frame for actuating said bar, and a detent attached to said frame for holding the pawls from the ratchet-bar.

6. In oil-well and similar jacks, the combination with a wrench provided with a shoulder or abutment near its end, of a reciprocating rack-bar engaging the same, a frame or cage having a passage-way through which said rack-bar moves; operating mechanism for said bar in said frame, and means for securing said frame to afloor or other support.

7. In oil-well and similar jacks, the combination with the wrench, of a reciprocating rack-bar engaging the same, a clamp secured to the wrench adjacent to the point of engagement of the rack-bar therewith, a frame or cage through which said rack-bar moves, operating mechanism for said bar in said frame or cage, and means for securing said frame or cage to a floor or other support.

In testimony whereof I, the said JOSIAH BARRETT, have hereunto set my hand.

JOSIAH BARRETT. 

